On the heels of the iPhone 4 news, NextWorth announced its new trade-in program for Apple iPhone owners that covers the full subsidized price of upgrading from the current iPhone 3Gs to the new iPhone 4. More info:

Currently, Nextworth customers can receive between $208 and $260 for their 16GB iPhone 3Gs and $254 to $299 for their 32GB when trading in their iPhone through the service. With the new 16GB iPhone 4 prices starting at $199, and the new 32GB starting at $299, trade-in amounts will fully cover the cost of an upgrade ? plus extra cash for accessories. Consumers can lock in the high trade-in prices today with NextWorth and the company will honor that price for up to 21 days.

Trading in an old iPhone is simple, with current market values and condition of the device determining the trade-in value. Simply enter the model, condition and any accessories and a value is displayed instantly. NextWorth sends a free shipping label and once received examines the product and sends the customer payment via check, PayPal or Target Gift card within seven to fourteen days.